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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
24/w = 12/8 // - 12/8
24/w-(12/8) = 0
24/w-3/2 = 0
24*w^-1 = 3/2 // : 24
w^-1 = 1/16
-1 < 0
1/(w^1) = 1/16 // * w^1
1 = 1/16*w^1 // : 1/16
16 = w^1
w = 16
w = 16
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